AngularJS: service and factory is singleton ?

Question

How could i prove with a sample code that angular service and factory is singleton

angular.module('myApp').service('helloService',function($timeout){
this.sayHello=function(name){
$timeout(function(){
alert('Hello '+name);
},2000);
}
});
angular.module('myApp').controller('TestController',
function(helloService){
helloService.sayHello('AngularJS'); // Alerts Hello AngularJS
});

so please come with a example code which tell me when i will run that angular service and factory is singleton. thanks

tri_inn · Answer

i being able to create a small program which can tell me the factory is singleton. so here is the program code myApp > FirstCtrl > Input is : {{data.firstName}} setData() >setData SecondCtrl > Input should also be here: {{data.firstName}} getData() >getData var myApp = angular.module( 'myApp'  []); myApp.factory( 'Data'  function(){ var service = { FirstName: ''  setFirstName: function(name) { // this is the trick to sync the data // so no need for a $watch function // call this from anywhere when you need to update FirstName angular.copy(name service.FirstName); } }; return service; }); // Step 1 Controller myApp.controller( 'FirstCtrl'  function( $scope Data ){ $scope.setData = function() { Data.FirstName= 'Tridip' ; }; }); // Step 2 Controller myApp.controller( 'SecondCtrl'  function( $scope Data ){ $scope.FirstName = Data.FirstName; $scope.getData = function() { alert( 'get data ' +Data.FirstName) }; });

tri_inn · Answer

i asked totally different question. i am looking for a code sample which show me that service and factory is singleton. i am not looking for ling which tell me what is service and factory or difference between them.

Manikandan Murugesan · Answer

Refer this link for create the singleton: https://blog.jdriven.com/2013/03/how-to-create-singleton-angularjs-services-in-4-different-ways/ This link for refer service vs factory : https://stackoverflow.com/questions/13762228/confused-about-service-vs-factory